We wish more homes in the states looked like this:

I know sod roof homes are typical to some Scandinavian homes. Whether old or modern? How well does the roof hold up to the weight. What about the weight of precipitation, snows, heavy rain. Some types of green roofs do have more demanding structural standards especially in seismic regions of the world. Some existing buildings cannot be retrofitted with certain kinds of green roof because of the weight load of the substrate and vegetation exceeds permitted static loading. And lets not forget those poorly planned ones.